Inner tube for tire-casings.



W. B-EGKWITH. INNER TUBE FOR TIRE GASINGS. APPLICATION FILED JUNE 6, 191 1.

Pat ent ed 'Jan. 30; 191 2. 1

14 C. Bec/dwa'i/Z UNITED STATES PA ENT OFFICE. Y

WALTER C(BECKWITH, or FOSTORIAfOH'IO INNER TUBE FOR TIRE-CASITTGS. 7

Specification of Letters Patent.

Patented Jan. 30,1912;

Application filed June a, 1911. Seria1 No."631,661.

To all 'wllom'z't may concern:

'Be it-known that I, WALTER. .C. BECK- WITH, a citizen of, the United States, residing at Fostoria, in the county of Seneca and State of Ohio, have invented certain new and useful Improvements in Inner Tubes for Tire-Casings, of which the following is a specification, reference being had therein to .the' accompanying drawing.

This invention relates to improvements in inner tubes for tire casings, and is particularly intended-for use in connection with the clencher form of automobile tire casing.

The primary object of my present invention is to provide a new article of manufac ture comprising an elastic envelop having an annular inflatable and deflatable airchamber at its inner side, formed by an anvnular elastic partition withinthe said envelop, an annular thick wall'tube located between the said partition and the tread side of the envelop and elastic filling around the .said thick wall tube and between the said partition and the tread side of the inner tube. 1

In the accompanying drawingsFigure 1 is a perspective view of a clencher tire casing and rim, the tire and rim shown in section with my improved inner tube therein. Fig. 2 is an enlarged transverse sec-- tional view of a clencher tire casing and rim showing position therein.

This improved inner tube is particularly intended for use connection with a clencher tire casing, whereby the clencher casing can be applied to and detached froin -the clencher rim with the inner tube in position therein, and at thesjame time provide an inner tube which is practically nonpuncturable and which will enable the outer casing to be worn practically down to the inner tube without a blow out which is so common with inner tubes in common use,

my improved inner tube in at its inner side with an annular air-chamber 4. This air-chamber 4 is formed by an the envelop 3, and having its edges 6 integral with the envelop or vulcanized thereto. Placed within the envelop 3 and beannular rubber partition 5 located within f tween its tread-side and the said partition 5,.is. a thick-wall annular" tube'7. This thick wall tube is formed of a combination of rubber and fabric so that itis' flexible. Thepartition 5 and tube? are secured togetherat the point 8 in the manufacture of this improved inner tube. With these parts se-i cured in the position described, the space around the thick wall tube 7 and between it, the partition and the tread side of the envelop 3, an elastic core filling 9 is placed. This elastic core is referably of such na ture that it is place within the envelop in a liquid or semi-liquid form, after which it solidifies into a solid elastic body andis preferably of a non-rubber nature. The-air within the thick wall tube7 is simply at atmospheric pressure and is for; the purpose of lightening the inner tube by lessening the amount of elastic core 9 required, and forms asupporting wall for'that portion of the '1 core which is in engagement with the thick wall tube 7. v l In operation air is forced into the airchamber 4, through the ordinary form of valve 10, and this places'the partition 4 under pressure and supports the elastic core 9 and thick wall tube 7. The thick wall tube 7 in addition to lightening the inner tube also serves to form the elastic core of substantially the same thickness throughout and thereby places all portions of the elastic core under substantially the same pressure. The pressure in the air-chamber placespressure onthe elastic core and this in turn laces a 1 pressure on the thick wall tube 7, which is of sufficient thickness to withstand the required pressure to support the weight placed onthe tire without collapsing, and in the'relation shown herein, constitutes a non-collapsible flexible tube, it is non-collapsible in that the pressure all around it is equal in all directions, and by reason of its thick wall withstands this pressure without collapsing and without any pressure The foregoing construction produces an inner tube in which the elastic core performs all of its functions of being non-puncturable and of preventing blow outs the same as therein above at'mospheric pressure.

though the whole space between the partition 5, and the tread side of the envelop 3 V were completely filled with the elastic core 9.

As state the thick wall non collapsible tube 7 serves the double function of lightening an elastic mre inner tube, and of causing an equal pressure upon all parts of the elastic core Without robbing it of its advantages heretofore referred to. v

The objects of having the air chamber 4 is to enable the inner side of the inner tube to be deflated so that the clencher portion of the casing 2 may be removed from the rim 1 and also deflated, so that the inner tube can be placed in the casing in the manner in which the ordinary inner tubes are placed therein and the case interlocked with the rim, and the air-chamber inflated which will lock the casing to the rim. An inner tube of this construction has all the advantages of an inner tube which is completely filled with an elastic core with the advantages that the inner tube can be placed within a clenched casing and removed therefrom which is not noiaiaa true'when the inner tube iscompletely" filled with an elastic core.

Having thus described my inventiomwhat I claim and desire to secure by Letters Patent is:

An improved article of manufacture for the purpose described, comprising an annular tubular rubber envelop having an annu: lar rubber partition adjacent its inner side to form an inflatable and deflatable annular air-chamber; a thick Wall non-collapsible an nular flexible tube located between the parti tion and the outside of the envelop, the inner periphery of the tube resting against and secured to the partition, and an elastic core filling the space between the tube, the partition and the outside of the envelop.

In testimony whereof I hereunto aifix my signature in the presence of two witnesses.

war/ran c. BECKWITH.

Witnesses:

FLORENCE Enmsort; CLARENCE B. BROWN. 

